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First when we inhale, the air goes through the tubes and airways, then goes to the throat, and the air moves through the larynx, and goes down through the trachea or wind pipe, and the trachea divide in to two the right and left bronchus, and the air continue  goes through the bronchi, and through the bronchioles that divide into smaller air passage, and goes through the bunch of air sacs "alveoli". when carbon dioxide takes place, the waste material goes to the capillaries walls and into the alveoli, and then repeat cycle, through the "bronchioles to bronchi to trachea, to windpipe to larynx to the throat and repeat.

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